Abstract
Ouro Preto city is located in the Iron Quadrangle, where Arsenic-bearing minerals are easily found; therefore, human exposure to As is a concern. The aim of this study was to assess the influence of organic matter (OM) and microbiota on As mobility. Soil samples were collected from deactivated gold mines to achieve this goal. Soil aliquots (5 g) were exposed to different extractant mixtures: CaCl2, 2.5 mmol −1 (A); CaCl2 + 5 g of proteic biomass - PB (B); CaCl2 + bacterial inoculum (C); CaCl2 + 5 g of PB + inoculum (D); and organic acid solution - OAS (0.1 mol−1) (E). Solubility tests were conducted at room temperature for 120 days (A–D) or 48 h (E). PB increased As mobility up to 600 times compared to that of the control group (A). As mobility in the presence of bacteria was slightly lower thus highlighting the effects of microbiota and OM on As mobilization. Principal component analyses indicated Ca, Fe, Mn, P, Mg, Sr, As, and Cd were the main contributing factors. In the presence of OM, Zn, Cu, Pb, Cd, As, and Cr were leached. The positive effect of OM and indigenous microorganisms on As mobility was confirmed, reinforcing the need to adopt preventive measures to avoid potential environmental damage due to ineffective management of urban and industrial waste deposition in such As-contaminated urban areas.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
